Section 1. ORGANIC AND HYBRID MATERIALS Invited Paper SILICA-MOUNTED FTIR-ACTIVE ORGANOMETALCARBONYL DERIVATIVES AS FUNCTIONAL MATERIALS

Organometalcarbonyl complexes adsorbed onto silica and covalently attached to ~63 µm, ~15 µm and ~7 nm diameter silica particles have been studied by IR and 29Si MAS NMR. The properties of the characteristic vibrational stretching modes of the M-CO groups examined by FTIR spectroscopy using ATR, DRIFT, and an optrode assembly, are discussed. In the 29Si NMR spectra, an additional signal in the-20 ppm region was observed in the presence of the covalently attached organometallic, and the intensity of the Q3 band shoulder of the main bulk Q4 silica signal at –110 ppm was reduced in intensity. Determination of surface loading of the silica by microanalysis, AA, DRIFT and 29Si NMR is compared. The FTIR spectra are compared by the use of Bellamy plots, and normalised differential response ratios are used to quantify the contributions of environmental effects on the relative positions of the ν(CO) vibrational stretching modes of organometallic complexes. The terms ∆R and ∆N are defined